Matsya Purana — The Cave-Sanctuary: Jewel-Lake
सूर्येन्दुकान्तयश्चैव नीलो वर्णान्तिमश्च यः ज्योतीरसस्य रम्यस्य स्यमन्तस्य च भागशः //
sūryendukāntayaścaiva nīlo varṇāntimaśca yaḥ jyotīrasasya ramyasya syamantasya ca bhāgaśaḥ //
Likewise, there are the Sun-stone (sūryakānta) and Moon-stone (candrakānta); and that gem which is deep blue as the final shade of color—these, in due portions, are shares of the lovely radiance-essence (jyotīrasa), namely the Syamantaka.
This verse does not address pralaya; it belongs to a technical section on gems, describing how certain luminous stones are considered portions or types related to the famed Syamantaka jewel.
In a royal/householder context, ratna-lakṣaṇa guides the selection and valuation of auspicious, high-quality gems—useful for treasury management, gifts (dāna), and ritual patronage—by identifying recognized classes like sūryakānta, candrakānta, and nīla gems.
The verse implies ritual-utility through “radiance-essence” gems: such stones are traditionally recommended for consecrations, offerings, and ornamentation of icons/temples where brilliance and auspicious qualities (tejas/jyotis) are symbolically important.